Question

Reflex actions are under the control of

• A. brain
• B. spinal cord
• C. medulla
• D. spinal cord and medulla

Answer 1

The correct option is D

spinal cord and medulla

The correct option is D.

Explanation of the correct option :

1. Automatic response to the action of a stimulus is called reflex action.
2. They are controlled by the reflex centres present in the medulla and spinal cord.
3. The sensory cells carry the input from the receptor impulses to a central interneuron, which makes contact with a motor neuron to produce a reflex.

Explanation of the incorrect option:

Option A:

All these responses do not involve the action of the brain.

Option B:

Spinal cord contains reflex centres to control the reflex actions.

Option C:

Medulla oblongata also contains centres to control the reflex actions.

Final answer: Reflex actions are under the control of medulla and spinal cord.